1999 Chevy Venture thermostat

3.4L Engine Disconnect the negative battery cable. Remove the air cleaner and duct assembly. Partially drain the cooling system into a suitable container, to a level below the thermostat. Disconnect the radiator hose from the coolant outlet. Unfasten the coolant outlet retaining bolts.

Remove the outlet, then remove the thermostat. Thoroughly clean the gasket mating surfaces To install: Install the new thermostat with the pellet towards the engine. Install the outlet to the intake manifold. Apply RTV sealant to the housing bolts and tighten to 18 ft. lbs. (25 Nm) Reconnect the radiator hose to the thermostat coolant outlet. Install the air cleaner and duct assembly. Refill the coolant and check for leaks. When adding coolant, it is important that you use DEX-COOL ® (orange colored, silicate-free) coolant. If silicate coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner. Connect the negative battery cable.